Gaseous exchange in plant

A) Guard cell:

sausage in shape : allow change of turgidity cause bending thich inner wall : allow bend in side substomatal space : allow gaseous diffusion chloroplast : allow photosynthetic product relay to change in shape

 

B) lenticel:

-layers of dead cells with lots of air space, air diffuse in through the air space to reach the living tissue.

special surface connected to inner system simple diffusion of gaseous smaller the pole, more efficient of gaseous exchange no control mechanism

 

C) root:

1. no cuticule, oxygen are free to diffuse
2. large surface area
3. intercellular spare in cortex, rapid diffusion of oxygen to inner system